Insert N rows

[cyphysical]

Hello, I am considering using the lib and I've not found how inserting N rows is handled. The query is something like:

insert into <table> (<col1>, <col2>) values (<col1val1>, <col2val2>), ..., (<col1valN>, <col2valN>);

[kyleconroy]

Inserting a variable number of rows in current not supported, as it would require dynamically generated SQL. Please see #218 and #216 for previous discussions.